{"id":"CVE-2026-43093","summary":"xsk: tighten UMEM headroom validation to account for tailroom and min frame","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: tighten UMEM headroom validation to account for tailroom and min frame\n\nThe current headroom validation in xdp_umem_reg() could leave us with\ninsufficient space dedicated to even receive minimum-sized ethernet\nframe. Furthermore if multi-buffer would come to play then\nskb_shared_info stored at the end of XSK frame would be corrupted.\n\nHW typically works with 128-aligned sizes so let us provide this value\nas bare minimum.\n\nMulti-buffer setting is known later in the configuration process so\nbesides accounting for 128 bytes, let us also take care of tailroom space\nupfront.","modified":"2026-05-21T03:54:31.663534172Z","published":"2026-05-06T07:40:25.266Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43093.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0ec4d3f6e6934deb843b561ae048cd17218e5ad1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6523bc1b40e69301f24c14338b762af4739d6d39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a03975beb9f6af0d8ac051e30b2abeabe618414f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a315e022a72d95ef5f1d4e58e903cb492b0ad931"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43093.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43093"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"99e3a236dd43d06c65af0a2ef9cb44306aef6e02"},{"fixed":"a03975beb9f6af0d8ac051e30b2abeabe618414f"},{"fixed":"0ec4d3f6e6934deb843b561ae048cd17218e5ad1"},{"fixed":"9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12"},{"fixed":"6523bc1b40e69301f24c14338b762af4739d6d39"},{"fixed":"a315e022a72d95ef5f1d4e58e903cb492b0ad931"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee"},{"last_affected":"25c9cdef57488578da21d99eb614b97ffcf6e59f"},{"last_affected":"98d3c852e63b49129515dd18c875999efaf8530a"}]}],"versions":["v5.6","v5.6.6","v5.4.34","v4.19.117","v5.6.5","v5.4.33","v4.19.116","v5.6.4","v5.4.32","v4.19.115","v5.6.3","v5.4.31","v4.19.114","v5.6.2","v5.4.30","v5.6-rc1","v4.19.113","v5.4.29","v5.6.1","v5.4.28","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.4.27","v4.19.112","v5.4.26","v4.19.111","v5.4.25","v4.19.110","v4.19.109","v5.4.24","v4.19.108","v5.4.23","v4.19.107","v5.4.22","v4.19.106","v5.4.21","v4.19.105","v5.4.20","v4.19.104","v5.4.19","v4.19.103","v5.4.18","v4.19.102","v5.5","v5.4.17","v4.19.101","v5.5-rc5","v4.19.100","v5.4.16","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4.15","v4.19.99","v5.4","v4.19.98","v5.4.14","v5.5-rc4","v5.4.13","v4.19.97","v5.5-rc3","v5.5-rc6","v5.4.12","v4.19.96","v5.4.11","v4.19.95","v5.4.10","v4.19.94","v5.4.9","v5.4.8","v4.19.93","v5.4.7","v4.19.92","v5.4.6","v4.19.91","v5.4.5","v4.19.90","v5.4.4","v4.19.89","v5.4.3","v4.19.88","v5.4.2","v5.4-rc1","v4.19.87","v5.4.1","v5.4-rc6","v5.4-rc3","v4.19.86","v5.4-rc4","v5.4-rc8","v4.19.85","v4.19.84","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v4.19.83","v4.19.82","v4.19.81","v4.19.80","v4.19.79","v4.19.78","v4.19.77","v4.19.76","v4.19.75","v5.3-rc5","v5.3-rc1","v4.19.74","v5.3-rc2","v4.19.73","v5.3-rc3","v5.3-rc8","v4.19.72","v5.3-rc7","v5.3-rc4","v4.19.71","v4.19.70","v4.19.69","v5.2","v5.3-rc6","v4.19.68","v4.19.67","v4.19.66","v4.19.65","v4.19.64","v4.19.63","v4.19.62","v4.19.61","v4.19.60","v5.2-rc2","v4.19.59","v5.2-rc7","v5.2-rc4","v4.19.58","v5.2-rc1","v4.19.57","v5.2-rc5","v5.2-rc6","v4.19.56","v5.2-rc3","v4.19.55","v5.1","v4.19.54","v4.19.53","v4.19.52","v4.19.51","v4.19.50","v4.19.49","v4.19.48","v4.19.47","v4.19.46","v4.19.45","v4.19.44","v4.19.43","v5.0-rc8","v4.19.42","v5.1-rc7","v5.1-rc1","v4.19.41","v5.1-rc6","v4.19.40","v5.1-rc5","v4.19.39","v4.19.38","v5.0","v4.19.37","v5.1-rc3","v4.19.36","v5.1-rc2","v4.19.35","v5.1-rc4","v4.19.34","v5.0-rc1","v4.19.33","v4.19.32","v4.19.31","v4.19.30","v4.19.29","v4.19.28","v4.19.27","v4.19.26","v5.0-rc4","v5.0-rc3","v5.0-rc6","v4.19.25","v5.0-rc7","v4.19.24","v5.0-rc2","v4.19.23","v5.0-rc5","v4.19.22","v4.19.21","v4.19.20","v4.19.19","v4.19.18","v4.19.17","v4.20-rc1","v4.19.16","v4.19","v4.19.15","v4.20","v4.19.14","v4.19.13","v4.20-rc7","v4.20-rc5","v4.19.12","v4.20-rc6","v4.19.11","v4.19.10","v4.20-rc4","v4.20-rc2","v4.19.9","v4.19.8","v4.20-rc3","v4.19.7","v4.19.6","v4.19.5","v4.19.4","v4.19.3","v4.19.2","v4.19.1","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1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